Pixel structure and driving method capable of switching display mode

ABSTRACT

A pixel structure and a driving method are provided. The pixel structure includes a scan line, a first data line, a second data line, a first switching element, a second switching element, a common electrode, a first electrode and a second electrode. The first switching element is electrically connected with the scan line, the first data line and the first electrode. The second switching element is electrically connected with the second data line and the second electrode. The common electrode includes two first body portions and at least two first branch portions. The first electrode includes a second body portion and at least two second branch portions. The second electrode includes at least two main portions and at least one bridge portion. The at least one bridge portion overlaps at least one of the first branch portions in a projection direction.

CROSS-REFERENCE TO RELATED APPLICATION

This application claims the priority benefit of Taiwan applicationserial no. 107102545, filed on Jan. 24, 2018. The entirety of theabove-mentioned patent application is hereby incorporated by referenceherein and made a part of this specification.

BACKGROUND OF THE INVENTION Field of the Invention

The invention relates to a pixel structure, and particularly relates toa pixel structure having a common electrode, a first electrode and asecond electrode, and a driving method capable of switching displaymodes.

Description of Related Art

With advances in technology, demands for performance of displayapparatuses have been gradually increasing, especially virtual reality(VR) display apparatuses, augmented reality (AR) display apparatuses andso on. How to shorten liquid crystal response time is particularlyimportant in order to avoid image delay.

However, while shortening liquid crystal response time, a lighttransmittance of a pixel structure in a display apparatus is oftensacrificed. In order for the display apparatus to display a screen withsufficient brightness, more power is required to be provided to thebacklight module of the display apparatus. Therefore, there is a need tosolve the aforementioned problem.

SUMMARY OF THE INVENTION

The invention provides a pixel structure, adapted to perform anoperation mode for shortening liquid crystal response time and anoperation mode for high transmittance. Therefore, the operation mode forhigh transmittance may be performed under the situation when fast liquidcrystal response time is not required so as to save power consumption.

The invention provides a driving method capable of switching displaymodes including a fast mode for short response time of liquid crystaland a general mode for high transmittance. Therefore, the general modefor high transmittance may be performed under the situation when fastliquid crystal response time is not required so as to save powerconsumption.

At least one embodiment of the invention provides a pixel structure. Thepixel structure includes a scan line, a first data line, a second dataline, a first switching element, a second switching element, a commonelectrode, a first electrode and a second electrode. The first data lineand the second data line extend substantially in a first direction. Thefirst switching element is electrically connected to the scan line andthe first data line. The second switching element and the second dataline are electrically connected. The common electrode includes firstbody portions and first branch portions. The first body portions extendsubstantially in the first direction. The first branch portions arerespectively connected to the corresponding first body portions. Thefirst electrode is electrically connected to the first switchingelement. The first electrode includes a second body portion and secondbranch portions. The second body portion is located between the firstbody portions and extends substantially in the first direction. At leasttwo second branch portions are correspondingly electrically connected totwo sides of the second body portion and extend outwards. The secondelectrode is electrically connected to the second switching element. Thesecond electrode includes main portions and at least one bridge portion.The main portions extend substantially in the first direction. The atleast one bridge portion is electrically connected to the main portionsand overlaps at least one of the first branch portions in a projectiondirection. The at least one bridge portion does not overlap at least oneof the second branch portions in the projection direction.

At least one embodiment of the invention provides a pixel structure. Thepixel structure includes a scan line, a first data line, a second dataline, a first switching element, a second switching element, a commonelectrode, a first electrode and a second electrode. The first data lineand the second data line extend substantially in a first direction. Thefirst switching element is electrically connected to the scan line andthe first data line. The second switching element and the second dataline are electrically connected. The common electrode includes a firstbody portion and first branch portions. The first body portion extendssubstantially in the first direction. The first branch portions areconnected to the first body portions. The first electrode iselectrically connected to the first switching element. The firstelectrode includes a second body portion and second branch portions. Thesecond branch portions are connected to the second body portions. Thefirst branch portions and the second branch portions are substantiallylocated between the first body portion and the second body portion, andthe first branch portions and the second branch portions are alternatelyarranged in the first direction. The second electrode is electricallyconnected to the second switching element. The second electrode includesmain portions and at least one bridge portion. The main portions extendsubstantially in the first direction. The at least one bridge portion isconnected to the main portions. The at least one bridge portion and atleast one of the first branch portions overlap in a projectiondirection.

At least one embodiment of the invention provides a driving methodcapable of switching display modes, including: providing a displaydevice including at least one pixel structure as described above;performing a fast mode, including applying a first voltage to the atleast one first electrode, and not applying the first voltage to the atleast one second electrode and a common electrode; and performing ageneral mode, including applying a second voltage to the at least onesecond electrode, and not applying the second voltage to the at leastone first electrode and the common electrode.

One of the objectives of the invention is to provide a pixel structurecapable of shortening liquid crystal response time of a liquid crystaldisplay panel.

One of the objectives of the invention is to provide a pixel structurecapable of increasing a light transmittance of a liquid crystal displaypanel.

One of the objectives of the invention is to provide a driving methodcapable of switching display modes including a fast mode for shortliquid crystal response time and a general mode for high lighttransmittance. Therefore, the general mode for high transmittance may beperformed under the situation when fast liquid crystal response time isnot required so as to save power consumption.

To make the above features and advantages of the invention morecomprehensible, embodiments accompanied with drawings are described indetail as follows.

BRIEF DESCRIPTION OF THE DRAWINGS

FIG. 1A is a schematic top view of a pixel structure and surroundingelements thereof according to an embodiment of the invention.

FIG. 1B is a partially enlarged view of FIG. 1A.

FIG. 2A is a cross-sectional view taken along line AA′ in FIG. 1A.

FIG. 2B is a cross-sectional view taken along line BB′ in FIG. 1A.

FIG. 3A is a schematic top view of a pixel structure and surroundingelements thereof according to an embodiment of the invention.

FIG. 3B is a partially enlarged view of FIG. 3A.

FIG. 4A is a cross-sectional view taken along line AN in FIG. 3A.

FIG. 4B is a cross-sectional view taken along line BB′ in FIG. 3A.

FIG. 5 is a schematic top view of a pixel structure and surroundingelements thereof according to an embodiment of the invention.

FIG. 6 is a flowchart of a driving method capable of switching displaymodes according to an embodiment of the invention.

FIG. 7A is a simulation of a partially dark area of a pixel structure ina fast mode according to an embodiment of the invention.

FIG. 7B is a simulation of a partially dark area of a pixel structure ina general mode according to an embodiment of the invention.

FIG. 8A is a simulation of a partially dark area of a pixel structure ina fast mode according to an embodiment of the invention.

FIG. 8B is a simulation of a partially dark area of a pixel structure ina general mode according to an embodiment of the invention.

DETAILED DESCRIPTION OF DISCLOSED EMBODIMENTS

The invention will have a more comprehensive description hereinafterwith reference to the accompanying drawings, in which embodiments of theinvention are shown. As those skilled in the art would realize, thedescribed embodiments may be modified in various different ways, withoutdeparting from the spirit or scope of the invention.

The use of “electrically connected” in the text may mean that at leasttwo elements directly contact or indirectly electrically contact witheach other. The manner of being indirectly electrically contact witheach other is exemplified as the elements are in physical contact orelectrical contact with each other via an intermediate element. Theaforementioned intermediate element may be a switch (for example, a thinfilm transistor) or an element such as a resistor or a capacitor. Theuse of “electrically connected” may also represent that at least twoelements operate or act on each other.

FIG. 1A is a schematic top view of a pixel structure and surroundingelements thereof according to an embodiment of the invention. FIG. 1B isa partially enlarged view of FIG. 1A. For convenience of description,FIG. 1B illustrates a common electrode, a first electrode, and a secondelectrode, and omits other components. FIG. 2A is a cross-sectional viewtaken along line AN in FIG. 1A. FIG. 2B is a cross-sectional view takenalong line BB′ in FIG. 1A, wherein FIG. 1A omits some components in FIG.2A and FIG. 2B.

Referring to FIG. 1A, FIG. 2A and FIG. 2B, a pixel structure 10 includesa scan line SL, a first data line DL1, a second data line DL2, a firstswitching element T1, a second switching element T2, a common electrodeCE, a first electrode PE1, and a second electrode PE2.

The first switching element T1 is electrically connected to the scanline SL and the first data line DL1. The second switching element T2 andthe second data line DL2 are electrically connected. The secondswitching element T2 and the scan line SL are electrically connected,but the invention is not limited thereto. In other embodiments, thesecond switching element T2 may be electrically connected to anotherscan line. The first switching element T3 is electrically connected toscan line SL′ and the first data line DL1. The second switching elementT4 is electrically connected to the second data line DL2. The secondswitching element T4 is electrically connected to the scan line SL′, butthe invention is not limited thereto. In other embodiments, the secondswitching element T4 may be electrically connected to another scan line.The first switching element T3 and the second switching element T4 are,for example, switching elements belonging to other pixel structuresadjacent to the pixel structure 10.

The first data line DL1, the second data line DL2, and the first dataline DL1′ extend substantially along first direction E1. The scan lineSL and the scan line SL′ extend substantially in second direction E2,but the invention is not limited thereto. The second direction E2 issubstantially perpendicular to the first direction E1, but the inventionis not limited thereto.

In the embodiment, although the scan line SL, the scan line SL′, thefirst data line DL1, the first data line DL1′ and the second data lineDL2 are, for example, linear, the present invention is not limitedthereto. In other embodiments, the scan line SL, the scan line SL′, thefirst data line DL1, the first data line DL1′, and the second data lineDL2 may be zigzag or other shapes. The second data line DL2 is locatedbetween the first data line DL1 and the first data line DL1′, whereinthe first data line DL1′ is, for example, a data line belonging toanother pixel structure adjacent to the pixel structure 10. In someembodiments, a black matrix (not shown) covers the scan line SL, thefirst data line DL1 and the second data line DL2, but the invention isnot limited thereto.

Referring to FIG. 1A, FIG. 2A and FIG. 2B together, the scan line SL,the first data line DL1, the second data line DL2, the first switchingelement T1, the second switching element T2, the common electrode CE,the first electrode PE1, the second electrode PE2, the first electrodePEP and the second electrode PET are located on substrate SB, whereinthe first electrode PEP (not shown in FIG. 1A) and the second electrodePET (not shown in FIG. 1A) are, for example, electrodes belonging toanother pixel structure adjacent to the pixel structure 10.

In the present embodiment, the first switching element T1 includes, forexample, first gate G1A, second gate G1B, channel layer CH1, source S1and drain D1, wherein the first gate G1A and the second gate G1B areelectrically connected to the scan line SL, and the source S1 iselectrically connected to the first data line DL1. First insulatinglayer I1 and light shading layer SM are selectively disposed between thechannel layer CH1 and the substrate SB, wherein the light shading layerSM may improve current leakage of the first switching element T1. Thechannel layer CH1 overlaps the first gate G1A and the second gate G1B.Second insulating layer I2 is interposed between the channel layer CH1and the first gate G1A and between the channel layer CH1 and the secondgate G1B. Third insulating layer I3 is formed on the second insulatinglayer I2, the first gate G1A and the second gate G1B. The source S1 andthe drain D1 are formed on the third insulating layer I3, and arerespectively electrically connected to the channel layer CH1 by openingO1 and opening O2. The opening O1, for example, penetrates the secondinsulating layer I2 and the third insulating layer I3. The opening O2,for example, penetrates the second insulating layer I2 and the thirdinsulating layer I3.

Fourth insulating layer I4 is formed on the third insulating layer I3,the source S1 and the drain D1. In the present embodiment, the commonelectrode CE and the first electrode PE1 are formed on the fourthinsulating layer I4. The first electrode PE1 is electrically connectedto the drain D1 of the first switching element T1. In the presentembodiment, the first electrode PE1 is electrically connected to thedrain D1 through opening H1 of the fourth insulating layer I4. Theopening H1, for example, overlaps the opening O2, but the invention isnot limited thereto.

The second switching element T2 includes, for example, first gate G2A,second gate G2B, channel layer CH2, source S2 and drain D2, wherein thefirst gate G2A and the second gate G2B are electrically connected to thescan line SL, and the source S2 is electrically connected to the seconddata line DL2. In the present embodiment, although the first switchingelement T1 and the second switching element T2 are both electricallyconnected to the same scan line SL, the invention is not limitedthereto. In other embodiments, the first switching element T1 and thesecond switching element T2 may be electrically connected to differentscan lines.

The first insulating layer I1 and the light shading layer SM areselectively disposed between the channel layer CH2 and the substrate SB,wherein the light shading layer SM may improve the current leakage ofthe second switching element T2. The channel layer CH2 overlaps thefirst gate G2A and the second gate G2B. The second insulating layer I2is interposed between the channel layer CH2 and the first gate G2A andbetween the channel layer CH2 and the second gate G2B. The thirdinsulating layer I3 is formed on the second insulating layer I2, thefirst gate G2A and the second gate G2B. The source S2 and the drain D2are formed on the third insulating layer I3, and are respectivelyelectrically connected to the channel layer CH2 by opening O3 andopening O4. The opening O3, for example, penetrates the secondinsulating layer I2 and the third insulating layer I3. The opening O4,for example, penetrates the second insulating layer I2 and the thirdinsulating layer I3.

The fourth insulating layer I4 is formed on the third insulating layerI3, the source S2 and the drain D2. The second electrode PE2 iselectrically connected to the drain D2 of the second switching elementT2. In the present embodiment, the drain D2 and the second electrode PE2may be integrally formed by a single layer and directly connected, butthe invention is not limited thereto. The common electrode CE and thefirst electrode PE1 are formed on the fourth insulating layer I4. Afifth insulating layer I5 is formed on the first electrode PE1, thecommon electrode CE and the fourth insulation layer I4. The secondelectrode PE2 is formed on the fifth insulating layer I5. The secondelectrode PE2, the first electrode PE1, and the common electrode CE areseparated from each other. In the present embodiment, opening H2penetrates the fourth insulating layer I4 and the fifth insulating layerI5. The second electrode PE2 is electrically connected to the secondswitching element T2 through the opening H2. The opening H2, forexample, overlaps the opening O4, but the invention is not limitedthereto. In other embodiments, the drain D2 and the second electrode PE2may be respectively formed by different conductive layers. The openingH2 and the opening O4 may not overlap.

In the present embodiment, the channel layer CH1 and the channel layerCH2 are, for example, L-shaped, but the invention is not limitedthereto. In other embodiments, the channel layer CH1 and the channellayer CH2 may be U-shaped or other shapes.

In the present embodiment, the first switching element T1 and the secondswitching element T2 are, for example, top gate type thin filmtransistors, but the invention is not limited thereto. The firstswitching element T1 and the second switching element T2 may be bottomgate type thin film transistors or other types of switching elements. Inthe present embodiment, each of the first switching element T1 and thesecond switching element T2 includes two gates, but the invention is notlimited thereto. In other embodiments, each of the first switchingelement T1 and the second switching element T2 includes only one gate.

The common electrode CE is formed on the fourth insulating layer I4. Thecommon electrode CE includes at least two of the first body portions andat least two of the first branch portions. Referring to FIG. 1B, firstbody portions 110A and 110B extend substantially in the first directionE1. First branch portions 120A and 120B are located between the firstbody portions 110A and 110B. The first branch portions 120A and 120B arerespectively connected to the corresponding first body portions 110A and110B. The first branch portion 120A, for example, extends in a directionfrom the first body portion 110A towards the first body portion 110B.The first branch portion 120B, for example, extends in a direction fromthe first body portion 110B towards the first body portion 110A. In someexemplary embodiments, a width of the first branch portion 120Agradually decreases along a direction away from the first body portion110A, and a width of the first branch portion 120B gradually decreasesalong a direction away from the first body portion 110B. In someexemplary embodiments, a shape of each of the first branch portions 120Aand 120B includes, for example, a trapezoid, a triangle, or othergeometric shapes. Referring to FIG. 1A and FIG. 1B together, the firstbody portion 110A and the first body portion 110B are electricallyconnected at least by intermediary portion 130. The intermediary portion130 is, for example, directly connected between the first body portion110A and the first body portion 110B. A length of the intermediaryportion 130 is greater than a length of the first branch portion 120Aand a length of the first branch portion 120B. The intermediary portion130, for example, overlaps the scan line SL or the scan line SL′. Theintermediary portion 130 is, for example, parallel to the scan lines SLor SL′, but the invention is not limited thereto.

The first electrode PE1 is formed on the fourth insulating layer I4. Thefirst electrode PE1 is separate from the common electrode CE. The firstelectrode PE1 includes a second body portion and at least two secondbranch portions. Referring to FIG. 1B, second body portion 210 islocated between the first body portion 110A and the first body portion110B, and extends substantially in the first direction E1. The secondbranch portions 220A and 220B are correspondingly electrically connectedto two opposite sides of the second body portion 210 and extendoutwards. The second branch portions 220A and 220B, for example,respectively extend towards the first body portions 110A and 110B. Thesecond branch portions 220A and 220B are, for example, aligned withrespect to the second body portion 210. The adjacent second branchportion 220A and second branch portion 220B are, for example,mirror-symmetrical to each other with respect to the second body portion210. Referring to FIG. 1A and FIG. 1B together, the second body portion210, for example, overlaps the second data line DL2 in a projectiondirection E3. A width of the second body portion 210 is, for example,greater than a width of the second data line DL2, but the invention isnot limited thereto. The projection direction E3, for example, isperpendicular to the substrate SB.

The second branch portion 220A includes extending portion 222A andtrapezoid structure 224A. The extending portion 222A extendssubstantially in a second direction E2. A width of the extending portion222A, for example, gradually decreases along a direction away from thesecond body portion 210. The trapezoid structure 224A is connectedbetween the second body portion 210 and the extending portion 222A. Awidth of the trapezoid structure 224A, for example, gradually increasesalong a direction away from the second body portion 210. The secondbranch portion 220B includes extending portion 222B and trapezoidstructure 224B. The extending portion 222B extends substantially in thesecond direction E2. A width of the extending portion 222B, for example,gradually decreases along a direction away from the second body portion210. The trapezoid structure 224B is connected between the second bodyportion 210 and the extending portion 222B. A width of the trapezoidstructure 224B, for example, gradually increases in a direction awayfrom the second body portion 210.

When the first electrode PE1 of the pixel structure 10 is used to drivea liquid crystal located thereon, since the trapezoid structure 224A andthe trapezoid structure 224B are respectively connected between thesecond body portion 210 and the extending portion 222A and between thesecond body portion 210 and the extending portion 222B, an electricfield may be more concentrated at a location near the second bodyportion 210, such that the portion with poor liquid crystal efficiencyof the liquid crystal layer (not shown) can be restricted at thelocation near the second body portion 210. In addition, since the secondbody portion 210 overlaps the second data line DL2, the second data lineDL2 may further shield most of the aforementioned portion with poorliquid crystal efficiency, thereby increasing the liquid crystalefficiency of the entire liquid crystal display panel.

In the present embodiment, the common electrode CE and the firstelectrode PE1 are, for example, formed by a same patterned conductivelayer. In other words, the common electrode CE and the first electrodePE1 are formed in the same patterning process, but the invention is notlimited thereto.

The second electrode PE2 includes at least two main portions and atleast one bridge portion. Main portions 310A and 310B extendsubstantially in the first direction E1. In some embodiments, the firstbody portions 110A and 110B respectively overlap the main portions 310Aand 310B. The first body portion 110A and its adjacent main portion 310Amay be separated by distance F1. The first body portion 110B and itsadjacent main portion 310B may be separated by distance F2. Each of thedistance F1 and the distance F2 is from 0 microns to 5 microns. In someembodiments, the second body portion 210 is separated from its adjacentmain portion 310A (or main portion 310B) by distance F3, and thedistance F3 is from 10 microns to 30 microns.

Referring to FIG. 1A and FIG. 1B together, each of the main portions310A and 310B overlaps the first data line DL1 or the second data lineDL2 in the projection direction E3. In the present embodiment, the firstdata line DL1 and the first data line DL1′ respectively overlap the mainportion 310A and the main portion 310B in the projection direction E3,but the invention is not limited thereto. In other embodiments, thefirst data line DL1 and the first data line DL1′ respectively overlapthe first body portion 110A and the first body portion 110B in theprojection direction E3. In some embodiments, the main portion 310A andthe main portion 310B respectively partially overlap the first bodyportion 110A and the first body portion 110B in the projection directionE3.

The bridge portion 320 is located between the main portions 310A and310B, and electrically connects the main portions 310A and 310B. Thebridge portion 320 overlaps at least one of the first branch portions120A and 120B in the projection direction E3. In the present embodiment,the bridge portion 320 partially overlaps the first branch portions 120Aand 120B in the projection direction E3. In other words, the bridgeportion 320 does not completely overlap the first branch portions 120Aand 120B in the projection direction E3, and the bridge portion 320exposes a portion of the first branch portion 120A and a portion of thefirst branch portion 120B in the projection direction E3. The bridgeportion 320 does not overlap at least one of the second branch portions220A and 220B in the projection direction E3. In the present embodiment,the bridge portion 320 does not overlap the second branch portions 220Aand 220B in the projection direction E3.

The bridge portion 320 includes two main connecting portions 322A and322B that are electrically connected to each other. The main connectingportion 322A includes first connecting portion 3222A, second connectingportion 3224A, and third connecting portion 3226A that are sequentiallyconnected. The main connecting portion 322B includes first connectingportion 3222B, second connecting portion 3224B, and third connectingportion 3226B that are sequentially connected. The first connectingportions 3222A and 3222B are respectively connected to the correspondingmain portions 310A and 310B. A width of the second connecting portion3224A, for example, gradually decreases along a direction approachingthe third connecting portion 3226A, and a width of the second connectingportion 3224B, for example, gradually decreases along a directionapproaching the third connecting portion 3226B. For example, the angleformed between the sidewall of any one of the second connecting portions3224A and 3224B close to the scan line SL and the second direction E2 isabout 2 degrees. The angle formed between the sidewall of any one of thesecond connecting portions 3224A and 3224B away from the scan line SLand the second direction E2 is about 4 degrees, but the invention is notlimited thereto.

The third connecting portions 3226A and 3226B of the main connectingportions 322A and 322B are overlapped the second body portion 210 in theprojection direction E3, and are connected to each other to form convexportion P and concave portion C disposed opposite to each other.

The extending direction A1 of the first connecting portion 3222A is, forexample, different from the extending direction A2 of the secondconnecting portion 3224A. The extending direction A2 of the secondconnecting portion 3224A is, for example, different from the extendingdirection A3 of the third connecting portion 3226A. The extendingdirection B1 of the first connecting portion 3222B is, for example,different from the extending direction B2 of the second connectingportion 3224B. The extending direction B2 of the second connectingportion 3224B is, for example, different from the extending direction B3of the third connecting portion 3226B. When using the second electrodePE2 of the pixel structure 10 to drive a liquid crystal located thereon,since the extending directions A1 and A3 of the first connecting portion3222A and the third connecting portion 3226A are different from theextending direction A2 of the second connecting portion 3224A, and theextending directions B1 and B3 of the first connecting portion 3222B andthe third connecting portion 3226B are different from the extendingdirection B2 of the second connecting portion 3224B, an electric fieldmay be more concentrated at a location near the first body portions110A, 110B and/or the second body portion 210, such that the portionwith poor liquid crystal efficiency of the liquid crystal layer (notshown) can be restricted at the location near the first body portions110A, 110B and/or the second body portion 210. In addition, the seconddata line DL2 or a black matrix (not shown) may be used to furthershield most of the aforementioned portion with poor liquid crystalefficiency, thereby increasing the liquid crystal efficiency of theentire liquid crystal display panel.

In general, if rise time and decay time of a liquid crystal are shorter,the liquid crystal response time is shorter. [Formula 1] is an equationfor a liquid crystal rise time (τ_(rise)) and [Equation 2] is anequation for a liquid crystal decay time (τ_(decay)).

$\begin{matrix}{\tau_{rise} = \frac{\gamma_{1}}{\left\lbrack {\frac{\Delta \; ɛ\; E^{2}}{4\; \pi} - \frac{K_{1}\pi^{2}}{d^{2}} - \frac{K_{2}\pi^{2}}{l^{2}}} \right\rbrack}} & \left\lbrack {{Formula}\mspace{14mu} 1} \right\rbrack \\{\tau_{decay} = \frac{\gamma_{1}}{\left\lbrack {\frac{K_{1}\pi^{2}}{d^{2}} + \frac{K_{2}\pi^{2}}{l^{2}}} \right\rbrack}} & \left\lbrack {{Formula}\mspace{14mu} 2} \right\rbrack\end{matrix}$

In [Formula 1] and [Formula 2], γ₁ represents a rotational viscosity, Erepresents an electric field strength, d represents a thickness of aliquid crystal layer, K₁ and K₂ are elastic constants of the liquidcrystal, and Δε represents a dielectric constant difference of theliquid crystal. l is a vertical distance between two dark areas when anexternal electric field is applied to the liquid crystal layer, and lrepresents a domain size of the pixel structure. When the domain size lof the pixel structure is smaller, the liquid crystal response time isshorter.

In the present embodiment, when first voltage is applied to the firstelectrode PE1 and the first voltage is not applied to the secondelectrode PE2 and the common electrode CE, the domain size of the pixelstructure 10 may be regarded as L1. When second voltage is applied tothe second electrode PE2 and the second voltage is not applied to thefirst electrode PE1 and the common electrode CE, the domain size of thepixel structure 10 may be regarded as L2. Since the bridge portion 320partially overlaps the first branch portions 120A and 120B in theprojection direction E3 to create the aforementioned effect, L1 issmaller than L2.

In other words, when the first voltage is applied to the first electrodePE1 and the first voltage is not applied to the second electrode PE2 andthe common electrode CE, due to the smaller domain size L1, the pixelstructure 10 has an advantage of shortening the liquid crystal responsetime of the liquid crystal display panel. When the second voltage isapplied to the second electrode PE2 and the second voltage is notapplied to the first electrode PE1 and the common electrode CE, thedomain size L2 is larger, and the liquid crystal layer may have a higherlight transmittance. Therefore, when fast liquid crystal response timeis not required, the pixel structure 10 may be operated in a mode forhigher light transmittance, so as to save power consumption.

FIG. 3A is a schematic top view of a pixel structure and surroundingelements thereof according to an embodiment of the invention. FIG. 3B isa partially enlarged view of FIG. 3A, wherein FIG. 3B illustrates acommon electrode, a first electrode, and a second electrode, and omitsother components. FIG. 4A is a cross-sectional view taken along line ANin FIG. 3A. FIG. 4B is a cross-sectional view taken along line BB′ inFIG. 3A, wherein FIG. 3A omits some components in FIG. 4A and FIG. 4B.

Here, it should be noted that the disclosure of FIG. 3A, FIG. 3B, FIG.4A and FIG. 4B follow the reference numerals and the part of the contentof the disclosure of FIG. 1A, FIG. 1B, FIG. 2A and FIG. 2B, wherein thesame or similar reference numerals are used to represent the same orsimilar elements, and descriptions of the same technical content areomitted. Regarding the descriptions of the omitted portions, referencesmay be made to the aforementioned embodiments and the details are notrepeated herein.

The main difference between pixel structure 20 of FIG. 3A and pixelstructure 10 of FIG. 1A lies in that the shapes of the common electrodeCE, the first electrode PE1 and the second electrode PE2 of the pixelstructure 20 are different from the shapes of the common electrode CE,the first electrode PE1, and the second electrode PE2 of the pixelstructure 10.

Referring to FIG. 3A, FIG. 3B, FIG. 4A, and FIG. 4B, the pixel structure20 includes scan line SL, first data line DL1, second data line DL2,first switching element T1, second switching element T2, commonelectrode CE, first electrode PE1 and second electrode PE2.

The common electrode CE includes first body portion and first branchportions. Referring to FIG. 3B, the first body portion 110 extendssubstantially in the first direction E1. The first branch portion 120 isconnected to the first body portion 110. The first branch portion 120extends substantially in the second direction E2, but the invention isnot limited thereto. In some embodiments, the width of the first branchportion 120 gradually decreases along a direction away from the firstbody portion 110. In some embodiments, the shape of the first branchportion 120 includes, for example, a trapezoid, a triangle, or othergeometric shapes.

The first electrode PE1 is electrically connected to the drain D1 of thefirst switching element T1. The first electrode PE1 includes second bodyportion and second branch portions. Referring to FIG. 3B, the secondbody portion 210 extends substantially in the first direction E1. Thesecond branch portion 220 is connected to the second body portion 210.In the present embodiment, the second branch portion 220 extendssubstantially in the second direction E2, but the invention is notlimited thereto. In some embodiments, a width of the second branchportion 220 gradually decreases along a direction away from the secondbody portion 210. In some exemplary embodiments, the shape of the secondbranch portion 220 includes, for example, a trapezoid, a triangle, orother geometric shapes.

The first branch portion 120 and the second branch portion 220 aresubstantially located between the first body portion 110 and the secondbody portion 120. The first branch portion 120 and the second branchportion 220 are alternately arranged in the first direction E1.

The second data line DL2 and the first body portion 110, for example,extend substantially in the first direction E1. The second data line DL2overlaps the first body portion 110 in the projection direction E3, butthe invention is not limited thereto. In some exemplary embodiments, thesecond data line DL2, for example, overlaps the first body portion 110and the first branch portion 120 in the projection direction E3, but thesecond data line DL2 does not overlap the second branch portion 220 inthe projection direction E3. In some exemplary embodiments, the seconddata line DL2, for example, overlaps the first body portion 110, thefirst branch portion 120, and the second branch portion 220 in theprojection direction E3. In some exemplary embodiments, a distancebetween the second data line DL2 and the first data line DL1 isapproximately equal to a distance between the second data line DL2 andthe first data line DL1′, and a distance between the second data lineDL2 and the first body portion 110 is approximately equal to a distancebetween the second data line DL2 and the second body portion 210. Inother words, the second data line DL2 does not overlap the first bodyportion 110 and the second body portion 210 in the projection directionE3, but the second data line DL2 overlaps the first branch portion 120and the second branch portion 220 in the projection direction E3. Inthis way, more study of designing small gap between the second data lineDL2 and the first data line DL1′ may be avoided, and therefore pixelstructures 20 can be arranged in a higher concentration way.

In the present embodiment, the common electrode CE and the firstelectrode PE1 are, for example, formed by a same patterned conductivelayer. In other words, the common electrode CE and the first electrodePE1 are formed in the same patterning process, but the invention is notlimited thereto.

The second electrode PE2 is electrically connected to the drain D2 ofthe second switching element T2. In the present embodiment, the secondelectrode PE2 and the drain D2 belong to different conductive filmlayers, but the invention is not limited thereto. The second electrodePE2 includes at least two main portions and at least one bridge portion.Referring to FIG. 3B, the main portions 310A and 310B extendsubstantially in the first direction E1, and the bridge portion 320 isconnected to the main portions 310A and 310B. In the present embodiment,the bridge portion 320 overlaps the first branch portion 120 in theprojection direction E3. The bridge portion 320 exposes a portion of thefirst branch portion 120 in the projection direction E3. The bridgeportion 320 does not overlap at least one of the second branch portions220 in the projection direction E3. In the present embodiment, thebridge portion 320 does not overlap the second branch portions 220 inthe projection direction E3, but the invention is not limited thereto.

The bridge portion 320 includes the first connecting portion 3222, thesecond connecting portion 3224, and the third connecting portion 3226that are sequentially connected. The first connecting portion 3222 iscloser to the first body portion 110 than the second connecting portion3224, and the width of the second connecting portion 3224 graduallydecreases along a direction away from the first body portion 110. Thefirst connecting portion 3222 overlaps the first body portion 110 in theprojection direction E3, but does not overlap the second body portion210, the first branch portion 120 and/or the second branch portion 220.The third connecting portion 3226 overlaps the second body portion 210in the projection direction E3, but does not overlap the first bodyportion 110 and does not overlap the first branch portion 120 and/or thesecond branch portion 220, but the invention is not limited thereto.

The extending direction C1 of the first connecting portion 3222 is, forexample, different from the extending direction C2 of the secondconnecting portion 3224. The extending direction C2 of the secondconnecting portion 3224 is, for example, different from the extendingdirection C3 of the third connecting portion 3226. When the secondelectrode PE1 of the pixel structure 20 is used to drive a liquidcrystal located thereon, since the extending directions of the firstconnecting portion 3222 and the third connecting portion 3226 aredifferent from the extending direction of the second connecting portion3224, an electric field may be more concentrated at a location near thefirst body portion 110 and/or the second body portion 210, such that theportion with poor liquid crystal efficiency of the liquid crystal layer(not shown) can be restricted at the location near the first bodyportion 110 and/or the second body portion 210, and no more tautologyhere.

In the present embodiment, when first voltage is applied to the firstelectrode PE1 and the first voltage is not applied to the secondelectrode PE2 and the common electrode CE, a domain size of the pixelstructure 20 may be regarded as L1. When second voltage is applied tothe second electrode PE2 and the second voltage is not applied to thefirst electrode PE1 and the common electrode CE, a domain size of thepixel structure 20 may be regarded as L2. Since the bridge portion 320overlaps the first branch portion 120 in the projection direction E3, L1is smaller than L2.

In other words, when the first voltage is applied to the first electrodePE1 and the first voltage is not applied to the second electrode PE2 andthe common electrode CE, since the domain size L1 is smaller, and thepixel structure 20 has an advantage of shortening the liquid crystalresponse time of the liquid crystal display panel. When the secondvoltage is applied to the second electrode PE2, and the second voltageis not applied to the first electrode PE1 and the common electrode CE,the domain size L2 is larger, and the liquid crystal layer may have ahigher light transmittance. Therefore, when fast liquid crystal responsetime is not required, the pixel structure 20 may be operated in a modefor higher light transmittance, so as to save power consumption.

FIG. 5 is a schematic top view of a pixel structure and surroundingelements thereof according to an embodiment of the invention.

Here, it should be noted that the embodiment of FIG. 5 follows thereference numerals and part of the content of the disclosure of FIG. 1A,FIG. 1B, FIG. 2A and FIG. 2B, wherein the same or similar referencenumerals are used to represent the same or similar elements, anddescriptions of the same technical content are omitted. Regarding thedescriptions of the omitted portions, references may be made to theaforementioned embodiments and the details are not repeated herein.

The main difference between a pixel structure 30 of FIG. 5 and the pixelstructure 10 of FIG. 1A lies in that the second data line DL2 of thepixel structure 30 is disposed at a position different from that of thesecond data line DL2 of the pixel structure 10. The common electrode CE,the first electrode PE1, and the second electrode PE2 of FIG. 5 aresimilar to those of FIG. 1B.

Referring to FIG. 5 and FIG. 1B, the pixel structure 30 includes scanline SL, first data line DL1, second data line DL2, first switchingelement T1, second switching element T2, common electrode CE, firstelectrode PE1, and second electrode PE2. The first data line DL1 and thesecond data line DL2 extend substantially in a first direction E1. Thefirst switching element T1 is electrically connected to the scan line SLand the first data line DLL The second switching element T2 and thesecond data line DL2 are electrically connected. The common electrode CEincludes the first body portions 110A and 110B and the first branchportions 120A and 120B. The first body portions 110A and 110B extendsubstantially in the first direction E1. The first branch portions 120Aand 120B are respectively connected to the corresponding first bodyportions 110A and 110B. The first electrode PE1 is electricallyconnected to the first switching element T1. The first electrode PE1includes a second body portion 210 and second branch portions 220A and220B. The second body portion 210 is located between the first bodyportions 110A and 110B, and extends substantially in the first directionE1. The second branch portions 220A and 220B are correspondinglyelectrically connected to two opposite sides of the second body portion210 and extend outwards. The second electrode PE2 is electricallyconnected to the second switching element T2. The second electrode PE2includes main portions 310A and 310B and bridge portion 320. The mainportions 310A and 310B extend substantially in the first direction E1.The bridge portion 320 is electrically connected to the main portions310A and 310B. The bridge portion 320 overlaps at least one of the firstbranch portions 120A and 120B in the projection direction E3. The bridgeportion 320 does not overlap at least one of the second branch portions220A and 220B in the projection direction E3.

In the embodiment, the second data line DL2 of the pixel structure 30 isdisposed adjacent to the first data line DL1′, wherein the first dataline DL1′ is, for example, a data line belonging to other pixelstructure adjacent to the pixel structure 30. The second data line DL2,for example, overlaps the first body portion 110B of the commonelectrode CE and/or the main portion 310B of the second electrode PE2.In the present embodiment, the second data line DL2 does not overlap thefirst electrode PE1, the first body portion 110A and the first branchportion 120A in the projection direction E3, but may selectivelyoverlaps the first body portion 110B and/or the first branch portion120B.

In the present embodiment, when first voltage is applied to the firstelectrode PE1 and the first voltage is not applied to the secondelectrode PE2 and the common electrode CE, a domain size of the pixelstructure 30 may be regarded as L1. When second voltage is applied tothe second electrode PE2 and the second voltage is not applied to thefirst electrode PE1 and the common electrode CE, a domain size of thepixel structure 30 may be regarded as L2. Since the bridge portion 320and the first branch portions 120A and 120B overlap in the projectiondirection E3, L1 is smaller than L2.

In other words, when the first voltage is applied to the first electrodePE1 and the first voltage is not applied to the second electrode PE2 andthe common electrode CE, since the domain size L1 is smaller, and thepixel structure 30 has an advantage of shortening the liquid crystalresponse time of the liquid crystal display panel. When the secondvoltage is applied to the second electrode PE2 and the second voltage isnot applied to the first electrode PE1 and the common electrode CE, thedomain size L2 is larger, and the liquid crystal layer may have higherlight transmittance. Therefore, when fast liquid crystal response timeis not required, the pixel structure 30 may be operated in a mode forhigher light transmittance, so as to save power consumption.

FIG. 6 is a flowchart of a driving method capable of switching displaymodes according to an embodiment of the invention.

Here, it should be noted that the embodiment of FIG. 6 follows thereference numbers and part of the content of the aforementionedembodiments, wherein the same or similar reference numerals are used torepresent the same or similar elements, and descriptions of the sametechnical content are omitted. Regarding the descriptions of the omittedportions, references may be made to the aforementioned embodiments andthe details are not repeated herein.

Referring to FIG. 6, a driving method capable of switching display modesincludes step X1, step X2 and step X3.

Step X1 includes providing a display device, wherein the display deviceincludes at least a pixel structure of any one of the aforementionedembodiments.

Step X2 includes performing a fast mode. The step of performing the fastmode includes: applying a first voltage to the first electrode PE1 ofthe pixel structure, and not applying the first voltage to the secondelectrode PE2 and the common electrode CE of the pixel structure. Insome embodiments, the step of performing the fast mode further includesapplying a third voltage to the second electrode PE2 and the commonelectrode CE of the pixel structure.

In some embodiments, when performing the fast mode, the first voltage isgreater than 0 volts and smaller than 7 volts, and the third voltage is0 volts. In some embodiments, when performing the fast mode, no voltageis applied to the second electrode PE2 and the common electrode CE ofthe pixel structure. The voltage on each of the first electrode PE1 andthe common electrode CE of the pixel structure is, for example, 0 volts.

Step X3 includes performing a general mode. The step of performing thegeneral mode includes: applying a second voltage to the second electrodePE2 of the pixel structure, and not applying the second voltage to thefirst electrode PE1 and the common electrode CE of the pixel structure.In some embodiments, the step of performing the general mode furtherincludes applying a third voltage to the first electrode PE1 and thecommon electrode CE of the pixel structure.

In some embodiments, when the general mode is performed, the secondvoltage is 0 volts, and the third voltage is greater than 0 volts andsmaller than 7 volts. In some embodiments, when performing the generalmode, no voltage is applied to the first electrode PE1 and the commonelectrode CE of the pixel structure, and the voltage on the firstelectrode PE1 and the common electrode CE in the pixel structure is, forexample, 0 volts.

In the embodiment, the fast mode of the display device may be firstperformed, and then followed by switching the display device to thegeneral mode, but the invention is not limited thereto. In otherexemplary embodiments, the general mode is first performed, and thenfollowed by switching the display device to the fast mode. In otherwords, the invention does not limit the chronological order of the fastmode and the general mode.

In the embodiment, when the first voltage is applied to the firstelectrode PE1 and the first voltage is not applied to the secondelectrode PE2 and the common electrode CE, the pixel structure has theadvantage of shortening the liquid crystal response time of the liquidcrystal display panel. In other words, when performing the fast mode,the display device may have a higher frame per second (FPS), andsmoother and continuous images can be displayed. In general, FPS is usedto describe how many frames per second are played in a movie, anelectronic drawing, or a game.

In the present embodiment, when the second voltage is applied to thesecond electrode PE2 and the second voltage is not applied to the firstelectrode PE1 and the common electrode CE, the greater the verticaldistance between two dark areas, the higher the light transmittance ofthe liquid crystal layer. In other words, when performing the generalmode of the display device, the display device can display sufficientbrightness without requiring very high power consumption.

Based on the foregoing, the power consumption of the display device inthe general mode is lower than the power consumption of the displaydevice in the fast mode. Therefore, the operation mode for hightransmittance may be performed under the situation when fast liquidcrystal response time is not required so as to save power consumption.On the other hand, when a short liquid crystal response time isrequired, the display device may be switched to the fast mode, therebyincreasing the frames per second.

FIG. 7A is a simulation of a partially dark area of a pixel structure ina fast mode according to an embodiment of the invention. FIG. 7B is asimulation of a partially dark area of a pixel structure in a generalmode according to an embodiment of the invention. The pixel structure ofFIG. 7A and FIG. 7B is, for example, similar to the pixel structure ofFIG. 1A.

Referring to FIG. 7A and FIG. 7B together, when performing the fast modeor the general mode of the display device, a dark area will appear atlocations corresponding to the first branch portions and the secondbranch portions of the pixel structure.

Referring to FIG. 7A, when performing the fast mode, a width of the darkarea is larger, that is, a domain size of the pixel structure issmaller. Since the domain size is smaller, the pixel structure has anadvantage of shortening the liquid crystal response time of the liquidcrystal display panel.

Referring to FIG. 7B, when performing the general mode, a width of thedark area is smaller, that is, a domain size of the pixel structure islarger. The liquid crystal layer has a higher light transmittance.

Therefore, the general mode for high transmittance may be performedunder the situation when fast liquid crystal response time is notrequired so as to save power consumption.

FIG. 8A is a simulation of a partially dark area of a pixel structure ina fast mode according to an embodiment of the invention. FIG. 8B is asimulation of a partially dark area of a pixel structure in a generalmode according to an embodiment of the invention. The pixel structure ofFIG. 8A and FIG. 8B is, for example, similar to the pixel structure ofFIG. 3A.

Referring to FIG. 8A and FIG. 8B together, when performing the fast modeor the general mode of the display device, a dark area may appear inlocations corresponding to the first branch portions and the secondbranch portions of the pixel structure.

Referring to FIG. 8A, when performing the fast mode, a width of the darkarea is larger, that is, the domain size of the pixel structure issmaller. Since the domain size is smaller, the pixel structure has anadvantage of shortening the liquid crystal response time of the liquidcrystal display panel.

Referring to FIG. 8B, when performing the general mode, a width of thedark area is smaller, that is, the domain size of the pixel structure islarger. The liquid crystal layer may have a higher light transmittance.

Therefore, the general mode for high transmittance may be performedunder the situation when fast liquid crystal response time is notrequired so as to save power consumption.

Although the invention has been described with reference to the aboveembodiments, it will be apparent to one of ordinary skill in the artthat modifications to the described embodiments may be made withoutdeparting from the spirit of the invention. Accordingly, the scope ofthe invention will be defined by the attached claims and not by theabove detailed descriptions.

What is claimed is:
 1. A pixel structure, comprising: a scan line, afirst data line and a second data line, wherein each of the first dataline and the second data line substantially extends in a firstdirection; a first switching element, electrically connected with thescan line and the first data line; a second switching element,electrically connected with the second data line; a common electrode,comprising: a plurality of first body portions, substantially extendingin the first direction; and a plurality of first branch portions,respectively connected to corresponding ones of the first body portions;a first electrode, electrically connected to the first switchingelement, the first electrode comprising: a second body portion, locatedbetween the first body portions, and substantially extending in thefirst direction; and a plurality of second branch portions, electricallyconnected to two sides of the second body portion and extending outwardstherefrom; and a second electrode, electrically connected to the secondswitching element, the second electrode comprising: a plurality of mainportions, substantially extending in the first direction; and at leastone bridge portion, electrically connected to the main portions, whereinthe at least one bridge portion overlaps at least one of the firstbranch portions in a projection direction, and the least one bridgeportion does not overlap at least one of the second branch portions inthe projection direction.
 2. The pixel structure according to claim 1,wherein the at least one bridge portion exposes a portion of the firstbranch portions in the projection direction.
 3. The pixel structureaccording to claim 1, wherein the common electrode and the firstelectrode are formed by a same patterned conductive layer, the firstbody portions of the common electrode are electrically connected by anintermediary portion, and a length of the intermediary portion isgreater than a length of one or each of the first branch portions. 4.The pixel structure according to claim 1, wherein a width of each of thefirst branch portions gradually decreases along a direction away from acorresponding one of the first body portions.
 5. The pixel structureaccording to claim 1, wherein one or each of the second branch portionscomprises: an extending portion, substantially extending in a seconddirection, the second direction substantially perpendicular to the firstdirection; and a trapezoid structure, connected between the second bodyportion and the extending portion, a width of the trapezoid structuregradually increases along a direction away from the second body portion.6. The pixel structure according to claim 1, wherein the at least onebridge portion comprising: a plurality of main connecting portionselectrically connected to each other, each of the main connectingportions comprising: a first connecting portion, a second connectingportion and a third connecting portion sequentially connected, whereinthe first connecting portion is connected to a corresponding one of themain portions, an extending direction of the second connecting portionis different from an extending direction of the third connectingportion.
 7. The pixel structure according to claim 6, wherein the thirdconnecting portions of the main connecting portions connect with eachother to form a convex portion and a concave portion overlapping thesecond body portion in the projection direction and substantiallyarranged along the first direction, wherein each of the main portionsoverlaps the first data line or the second data line in the projectiondirection, and wherein the first body portion is apart from an adjacentone of the main portions by a distance of 0 microns to 10 microns. 8.The pixel structure according to claim 6, wherein one of the firstconnecting portions has an extending direction different from that ofthe second connecting portion connected thereto.
 9. The pixel structureaccording to claim 6, wherein a width of one of the second connectingportion gradually decreases along a direction approaching the thirdconnecting portion connected thereto.
 10. A pixel structure, comprising:a scan line, a first data line and a second data line, wherein the firstdata line and the second data line substantially extend in a firstdirection; a first switching element, electrically connected with thescan line and the first data line; a second switching element,electrically connected with the second data line; a common electrode,comprising: a first body portion, substantially extending in the firstdirection; and a plurality of first branch portions, connected to thefirst body portion; a first electrode, electrically connected to thefirst switching element, the first electrode comprising: a second bodyportion; and a plurality of second branch portions, connected to thesecond body portion, wherein the first branch portions and the secondbranch portions are substantially located between the first body portionand the second body portion, and the first branch portions and thesecond branch portions are alternately arranged in the first direction;and a second electrode, electrically connected to the second switchingelement, the second electrode comprising: a plurality of main portions,substantially extending in the first direction; and at least one bridgeportion, connected to the main portions, wherein the at least one bridgeportion and at least one of the first branch portions overlap in aprojection direction.
 11. The pixel structure according to claim 10,wherein the at least one bridge portion exposes a portion of the firstbranch portions in the projection direction.
 12. The pixel structureaccording to claim 10, wherein the common electrode and the firstelectrode are formed by a same patterned conductive layer.
 13. The pixelstructure according to claim 10, wherein a shape of each of the firstbranch portions comprises a trapezoid, and a width of each of the firstbranch portions gradually decreases along a direction away from thefirst body portion.
 14. The pixel structure according to claim 10,wherein the at least one bridge portion comprises a first connectingportion and a second connecting portion sequentially connected, whereinthe first connecting portion is closer to the first body portion thanthe second connecting portion, and a width of the second connectingportion gradually decreases along a direction away from the first bodyportion.
 15. The pixel structure according to claim 14, wherein anextending direction of the first connecting portion is different from anextending direction of the second connecting portion.
 16. The pixelstructure according to claim 10, wherein the at least one bridge portionand the second branch portions do not overlap in the projectiondirection.
 17. A driving method capable of switching display modes,comprising: providing a display device, the display device comprises atleast one pixel structure according to claim 1; performing a fast mode,comprising: applying a first voltage to the at least one firstelectrode, and not applying the first voltage to the at least one secondelectrode and the common electrode; and performing a general mode,comprising: applying a second voltage to the at least one secondelectrode, and not applying the second voltage to the at least one firstelectrode and the common electrode.
 18. The method according to claim17, wherein the first voltage is approximately equal to the secondvoltage.
 19. The method according to claim 17, wherein the step ofperforming the fast mode further comprises: applying a third voltage tothe at least one second electrode and the at least one common electrode.20. The method according to claim 19, wherein the first voltage isgreater than 0 volts and smaller than 7 volts, the second voltage is 0volts, and the third voltage is 0 volts.
 21. The method according toclaim 17, wherein the step of performing the general mode furthercomprises: applying a third voltage to the at least one first electrodeand the at least one common electrode.
 22. The method according to claim21, wherein the first voltage is 0 volts, the second voltage is 0 volts,and the third voltage is greater than 0 volts and smaller than 7 volts.23. The method according to claim 17, wherein the power consumption ofthe general mode is lower than the power consumption of the fast mode.24. A driving method capable of switching display modes, comprising:providing a display device, the display device comprises at least onepixel structure according to claim 10; performing a fast mode,comprising: applying a first voltage to the at least one firstelectrode, and not applying the first voltage to the at least one secondelectrode and the common electrode; and performing a general mode,comprising: applying a second voltage to the at least one secondelectrode, and not applying the second voltage to the at least one firstelectrode and the common electrode.